Metal-working machine.



E. W. CRELLIN. METAL WORKING MACHINE.

v APPLICATION :FILED JULY 19, 1909. 1 ,l 01,685. Patented June 30, 1914.

7 SHEETS-SHEET 1.

E. W. CRELLIN.

METAL` WORKING MACHINE.

APPLICATION FILED JULY 19, 1909A 1,101,685. Patented June 30,1914.

7 SHEETS-SHEET 2.

A.. Kamm ullllllmll l lllllll: lull la E. W. GRELLIN.

METAL WORKING MACHINE.

APPLIGATION FILED JULY 19,1909.

Patented June 30, 1914.

7 SHEETS-SHEET 3.

E. W. GRELLIN.

METAL WORKING MACHINE.

APPLICATION FILED JULY 19, 1909.

Patented June 30, 1914,

7 SHEETS-SHEET 4.

:OLUMRIA ILANOGMI'N co., wAllllNnTnN. n. c.

E. W. CRELLIN.

METAL WORKING MACHINE.

APPLICATION FILED JULY 19, 1909,

Patented June 30, 1914.

7 SHEETS-SHEET 5.

E. W. CRELLIN.

METAL WORKING MACHINE.

APELIGATION FILED JULY 19, 1909.

1,101,685, Patented June 30,1914.

[SHEETS-SHEET 6.

mi! w if rl III 1I mi 1 'MM i HMM.

WY'CCSEB.- Imaz-0571? E. W. GRELLIN.

METAL WORKING MACHINE.

APPLIOATION FILED JULY 19, 1909.

1,1 01,685, Patented June 30,1914.

7 SHEETS-SHEET 7.

kllllllunu Tm* uin 5 UNITED sTaTEs PATENT oFFIcE.

EDWIN W. CRELLIN, OF PHILADELPHIA, PENNSYLVANIA, .ASSIGNOR T UNIVERSAL SCREW CUTTING- COMPANY, A CORPORATION 0F DELAWARE.

.METAL-WORKING' MACHINE.

Specification of Letters Patent.

Patented June 30, 1914.

Application led July 19, 1909. Serial No. 508,432.

To allie/m it may concern Be it known that I, EDWIN W'. CRELLIN, a citizen of the United States, residing in Philadelphia, Pennsylvania,have invented certain Improvements in Metal-VVorking Machines, of which the following is a specification.

My invention relates to metal working machines of the screw cutting or threading type of the same general character as those illustrated in Patents Nos. 675,834 and 705,538; and the object of my invention is to provide a. machine of simple construction,

capable of cutting any size thread on a bar or tube of any length, of any diameter, and at any desired pitch. In addition my improved machine may be employed to cut keyseats and to groove bars, tubes or rolls, and is particularly adapted to produce duplicate work with the highest degree of accuracy.

Other features of my invention will be more fully pointed out hereinafter, reference being had to the accompanying drawings, in which:

Figure 1, is an elevation, partly in section, of a metal working machine available for use for cutting or threading screws, made in accordance with my invention; Fig. 2 is an enlarged sectional view of a portion of the structure shown in Fig. 1; Fig. 3, is an end elevation of the cutting mechanism of my improved machine' Fig. 4, is an enlarged transverse sectional View, taken' on. the line a-a, Fig. 1; Fig. 5, is an enlarged side elevation of the cutting end of the machine; Fig. 6 is an enlarged side elevation illustrating the means for transmitting rotative motion from the master screw to the blank; Fig. 7 is an enlarged side elevation illustrating the driving means for the master screw; Fig. 8, isa view similar to F ig. 6, illustrating one form of speed changing gears I may employ; Fig. 9, is a sectional view on the line b-J), Fig. 8, and Figs. 10, 11, 12, 13 and 14, are enlarged views, illustrating details of my invention.

Upon a suitable framework comprising a bed-plate or table 1, and legs 2, I mount the mechanism for cutting screw threads, keyways, &c., forming the subject of my invent-ion. At one end of the machine a cutter 3 and its driving mechanism are mounted; at the other end driving means for a master screw 4, serving as a pattern andv as means lfor rotating the blank to be threaded, is

mounted, and intermediate the ends of the machine and adapted to move on the bedplate 1 of the same is a carriage 5 to which the master screw and the blank to be threaded are secured. The, carriage has means whereby the rotative movement of the master screw is transmitted to the blank to be threaded; said carriage being moved forward in addition in order that the blank in progress of being cut may be advanced proportionately to the pitch of the thread cut thereon. The carriage is provided with means foi` transmitting movement of the master screw to the blank and in connection with this I mount speed changing gears on said carriage whereby I am enabled to con` trol the speed at which the blank under process of cutting is moved, irrespective of the pitch of the thread being cut thereon or the pitch of the master screw; all of which mechanism is more fully described hereinafter.

6 and 7 represent driving pulleys loosely mounted on a shaft 8 which is journaled in bearings 10; said pulleys differing in size whereby different speeds may be imparted to the driving and ycutting mechanisms.

Clutches 11 and 12 keyed to said shaft S are provided, with means for operating the same; such means being shown in the mid position with both of said clutches out, in Figs. 1 and 6. Either pulley may drive said shaft 8 when held in operative engagement with its respective clutch, 11 or 12, as the case may be, and one of said clutches is always in engagement with one of said pulleys during the operation of the machine. When the driving mechanism is actuated, the mechanism to drive the cutter is in action and the mechanism to rotate and feed the master screw is in operation. These several mechanisms are driven by means of shafts 13 and 14, operatively connected to the shaft 8 and to the cutter and master screw driving means by universal couplings 15.`

The cutter and its driving mechanism may be described as follows: Carried at one end of the machine is a suitable head or standard 16 having` slideways 17, upon which a bracket 1S is adapted to move vertically under the influence ot a screw 19 and hand wheel 20; said screw being provided with an index 19" in order that the depth of out maybe accurately determined and regulated. Journaled in thisl bracket is a short horizontal shaft 21, driven from the shaft 13, and carrying a bevel pinion 22. Pivotally mounted with respect to the bracket 18, being held thereto by a bolt 23, and nut 24, upon which bolt it may be turned,ris a head 25 which supports the cutter 3 and driving mechanism therefor. A bevel gear 27 journaled on the bolt 23 meshes with the pinion 2Q, and with a bevel pinion Q8 carried by a shaft 29 journaled in the head 25. The shaft 29 has a spur pinion 3() whichmeshes with a spur wheel 3l journaled on a spindle 32 mounted in the head 25; such spur wheel serving as an intermediate transmitting means,

and meshing in turn with a spur pinion 33 on a shaft 34 suitably journaled in the lower part of the head 25, and upon the end of said shaft 34, the cutter 3 is mounted. The head 25 is rotatable in the arc ota circle with respect to the bevel gear 27, and is held to the bracket by means of the bolt E23 and nut 24; being further supported by a roller bearing 271. The bolt is apertured throughout its length, the upper end being provided with a tube 35 whereby suitable liquid may be transmitted to the cutter to assist its cutting action and keep both cutter and blank cool. The angular position of the cutter with respect to the work is determined by swinging the head in the are of a circle; an index 25 being provided in order that the saine may be accurately determined and regulated, while the depth of the cut may be regulated by the screw 19 and hand-wheel 20 which controls the vertical position of the bracket supporting the head 25 carrying said cutter.

At the opposite end of the machine, the master screw 4 is mounted; one end of this screw being disposed in engagement Vwith half nuts 36 whereby it may be moved when rotated, while the other end is coupled to the carriage 5. The master screw is provided with a keyway 37 and keyed to the same is-a worm wheel 38; such worm wheel being driven by a worm 39 whereby the master `screw will be rotated and by its engagement with the half nuts will be caused to move longitudinally. The half nuts are removable in order that they may be changed, if desired, for different master screws and they are carried by movable members so that they may be brought into and out of engagement with the master screw to permit its withdrawal when it has been moved forward. Motion is imparted to the Worm to drive the worm wheel keyed to the master screw by means of friction gearing comprising a disk 40, and a roll 41 in engagement there with; said roll being carried by a shaft 42 which is connected by means of one of the universal couplings 15 to the shaft 14.

The master screw is rotated by the worm and worm wheel just referred to and is moved longitudinally by reason of its en gagement with the fixed halt' nuts. The carriage 5 has a journal or bearing 45, and adapted to such journal is a sleeve 46 having a shoulder 47 at one` end; being held to the carriage by means of lock nuts 48 at its opposite end. To provide for free movement of said sleeve within the journal, I provide horizontally rotatable rollers 49 which are disposed between special bearing rings 50 carried by the journal adjacent the sleeve. In addition to the rollers 49, I provide thrust bearings comprising disks 51 disposed in concentric rows between annular rings 52; bands 53 being provided to hold said disks in place. At the shouldered end of the sleeve 46, which is internally recessed to provide a pair of additional shoulders 54 and 55, I attach a coupling member 56. This mehr ber carries a ring 57 disposed a slight distance inwardly from the ond of the same and secured thereto by suitable means, screws 58, for instance. The end of the coupling member and said ring 57 engage the shoulders at the end of the sleeve, and to hold the coupling in place, I provide an addie tional ring 59 in engagement with the ring 57 and in which the coupling member is tree to turn; said ring 59 being held to the end of the sleeve 46 by screws 60, but 1naintained out of contact with the end o' said sleeve by its engagement with the ring 57. This couplingmember carries a gear wheel 61 whereby motion imparted thereto may be transmitted to other gearing for driving the sleeve 46 and the work to be operated upon, and has a threaded socket 62 to receive the end of the master screw 4. By prefer ence, I provide the coupling with a set screw 63 to engage and hold the threaded end of themaster screw thereto. i The gear wheel 61 is keyed to the coupling member and abuts a shoulder 61a thereon; being held thereto by a band 64 secured to the coupling member by suitable set screws. At the opposite end of the sleeve 46, a chuck 65 is coupled there` to. The chuck is carried by a anged collar 66, having one flange secured to the chuck by bolts 67 and another flange secured to a member 68 threaded on the end of the sleeve 46, by meansof studs 69. The sleeve 46 car* agences ting gearing may be transmitted to the blank held by the jaws of the chuck 65. By means of speed changing gear interposed between the two gear wheels referred to, I am enabled to drive the master screw at any speed desired, and to transmit to the blank from said master screw any speed desired, faster or slower than the master screw.

The powerrtransmitting and speed changing gear I have shown in side and front elevation in Figs. 3, 6, 8 and 9. In F ig.` 6, the coupling connecting the master screw;y to the sleeve is shown at the left of the drawing, while the chuck for engaging the blank is shown at the right hand side. The gear 70 carried by the sleeve for delivering movement to the blank is shown adjacent the chuck at the right of the sheet, while the gear 61 for transmitting the movement of the master screw tothe speed changing gears is shown at the left. Between these gears the power transmitt-in and speed changing mechanism is disposed. This comprises a frame 71 mounted on the carriage 5, and having a transmitting'shaft 72, intermediate shafts 7 3 and 74 upon which the speed changing gears are mounted and a countershaft 7 5, more particularly shown in Fig. 8. Hung from the transmitting shaft 72, are arms 7 6 and 77; lthe arm 76 carrying a gear wheel 78 which serves to transmit motion from the gear 61 driven by the master screw, to a pinion 79 on the transmitting shaft 72 which carries at its opposite end a 80 meshing with a gear wheel 81 carried by the arm 77, which gear 81 engages the gear wheel 70 on the sleeve 46 and drives the blank to be cut.

The means just described serve to transmit the movement of the master screw to the blank. The studs or spindles carrying the gear wheels 78 and 81 are adjustably disposed in slot-s in the arms 76 and 77, as may be seen upon reference to Fig. 9, so that other gear wheels of larger or smaller size may be mounted thereon and thereby effect a change in the speed delivered to the blank.

Instead of transmitting movement to the blank in the manner just described, `I may utilize the speed change gears carried bythe shafts 73 and 74, mounted in the frame 71, and clearly shown in Figs. 8 and 9. The transmitting shaft 7 2 has a pinion 83 splined thereto so as to be adjust-able thereon, and this may mesh with the gears S4, 85 or 86, and with the aid of .the intermediate gears 84, 85a and 86a, transmit movement `to a pinion 87 splined to the countershaft 75, said shaft having another pinion 88 meshing with the gear wheel 81 which in turn engages the gear wheel 70 on the sleeve 46 and drives the blank 1Vhen this form of the power transmitting means are employed,

inion the pinion 8O on the end of the shaft 72 is removed, while when the first mentioned power transmitting means are employed, the pinion 88 is not in use.

The driving means for the worm comprise preferably a friction disk 40 to which the worm shaft is secured, driven by a friction yroll 4l carried by a shaft 42 which is connected by means of one of the universal couplings 15 with the shaft 14. The shaft 42 1s provided with journal boxes 43 mounted in brackets 89 carried by studs 90 on the frame of the machine. Paralleling the shaft 42 is a threaded shaft 44 having its ends journaled in said brackets 89 and carrying a nut 91 with yoke arms embracing the friction roll 41. The shaft 44 may be turned by a crank 92; such action moving the nut 91 thereon which in turn moves the friction roll 41 from or toward the center of the friction disk 40; retarding or increasing the speed of the latter and the speed transmitted to the worm controlling the movement of the master screw.

The driving pulleys are provided with clutch mechanism, and such mechanism includes a means for throwing either clutch into action, or to the mid-position out of action, including a rod 94 paralleling the bed-plate of the machine and in position to be engaged by a portion of the clutch or the carriage upon which the latter' is mounted. 'Ihe rod 94 is journaled in suitable brackets 94a, and is providedwith engaging members 94b with which the chuck or carriage may contact and which will serve the purpose of moving an arm 94C, disposed in engagementl with the clutches, for the purpose of moving the same. By this means, he operation of the machine may be automatically stopped when the blank has been fed forward to the limit of its movement without damaging the same. Since the machine .may be driven by either pulley; different spceds being thereby attained, the engaging members with which the chuck or carriage may contact are arranged so that 4the rod 94 may be moved in either direction,

depending upon the pulley used as the driving means.

At the side of the bed-plate I provide a rack 95, and mounted in a suitable bearing 96 on the carriage is a shaft or spindle having a pinion 97 which meshes with a pinion 98 on a spindle 99. Fixed `to the pinion 98 is another pinion 100 which meshes sov with the rack 95. The shaft or spindle carrying the pinion 97 is provided with a handle 101, so that the carriage can be moved forward or back, as may be desired when the cutter has been raised from the blank and the half nuts have been backed away from the master screw.

The half nuts are carried by spindles having right and left-handed threads and these spindles are disposed in engagement with a worin threaded in opposite directions so that by turning said worin, the spindles can be moved in opposite directions, moving said half-nuts toward and from the master screw. This mechanism is well known and would seem to need no further description.

In order to maintain the friction driving means for the master screw in operative engagement, the brackets supporting the journal boxes 113 et the shaft 4-2 carrying the driving roll have springs 105 as shown in Fig. 12, which tend to press said roll against the disk 40. The brackets 89 are slidably mounted upon the studs 90 and carry a nut 107. Adapted to said nut is a screw 109, with a crank 110 at the end of the same so that by turning said crank the brackets 89 carrying the shaft 42 may be moved toward and from the friction disk to regulate the contact of the roll 41 therewith and thereby control the operation of the master screw. In addition, the driving pinion is movable longitudinally from and toward the center of said disk so that the speed transmitted may be tast or slow as desired, in the manner previously described.

Under certain conditions, it may be desirable to reproduce the master screw or to provide as the master screw a screw that is to be reproduced, and in such instance it is desirable that the reproduction, if multiplied, shall be identical with the original or master screw. To this end, the gearing, including the pinion G1, whereby the sleeve 46 is normally driven from the master screw, is disconnected and the coupling member 5G is secured to said sleeve so as to rotate with it and not independently thereof. This connection may be made by means of an ordinary set or thumb screw 112 such as illustrated in Fig. 18.

My improved machine is also available for cutting keyways in shafts or screws. To do this the sleeve Li6 is to be locked to the carriage 5, and this may be accomplished by means ot' a set screw 11S passing through the journal portion of the carriage and engaging a socket iu the sleeve, as shown by dotted lines, Fig. 2. The blank is supported at a convenient point behind the cutter by a suitable anvil secured to the bed plate of the machine and having an open bushing 115 which may be slipped on from the end of the blank and is held to the latter and to I the anvil by a spring pressed gib 110; t-he tension of which spring is controlled by a screw 117 having a hand wheel 118. rIhe bushing is anchored to the anvil by a pin 110 engaging a slot 120 in said anvil. When cutting a plurality of threads of the same pitch on a blank it is necessary that they be accurately spaced. To determine'this the collar G6 is provided with a scale and the member 68 has an index pointer for use therewith so that the collar may be set at an exact point when shifted the desired number of degrees to effect the cutting of the second thread in proper relative position with respect to the first.

It will be understood that the carriage and themaster screw may move in either direction; that the cutting may proceed at either end of the blank clutched to the chuck carried by said carriage, and that by reversing the movement of the blank through the proper manipulationi of the speed transmitting and speed changing gear I can cut left handed threads by simply changing the direction of movement of the master screw.

My improved machine is available for cutting screws, spirals, worms and keyseats, and for grooving rolls. Screws may be cut thereon of any length, of any pitch, of any style thread, and of any diameter, and upon solid or hollow blanks. Right l and left handed threads may be cut at will, and upon l the same blank, if desired; keyways may be cut of any size or length, and screws of the same size diameter and pitch may be reproduced indefinitely.

I claim:

1. In a screw cutting machine, the combination of a bed-plate, a carriage arranged to slide on said bed-plate, a rotatable sleeve journaled in said carriage constructed and arranged to carry a blank to be cut, a master screw coupled to the opposite end of said sleeve and rotatable with or independently of said sleeve, means at the opposite end of the master screw for driving the same, and means mounted on and movable with said carriage and in driving engagement with the master screw coupled thereto whereby the blank is driven from said master screw.

2. In a screw cutting machine, the combination of a bed-plate, a carriage arranged to slide on said bed-plate, a rotatable sleeve journaled in said carriage constructed and arranged to carry a blank to be cut, a master screw coupled to the opposite end of said sleeve and capable of rotation with and independently of said sleeve, means at the opposite end of the master screw for driving the same, and cliange-speed and transmitting gear mounted on said carriage and in driving engagement with the master screw coupled thereto whereby the blank is driven therefrom.

3. In a screw cutting machine, the combination of a bed plate, a carriage arranged to slide thereon, means for preventing lift of the carriage, a hollow sleeve rotatably mounted in said carriage and having ends projecting beyond the latter, one end carrying a blank to be cut, a master screw loosely coupled to the opposite end et said sleeve,

means at one endl of the master screw for driving the same, and means movable with said carriage and operatively connected to the opposite end of the master screw whereby the blank is driven therefrom.

4. In a screw cutting machine, the combination of a bed plate, a carriage arranged to slide thereon, means for preventing lift of the carriage, a hollow sleeve rotatably mounted in said carriage and having ends projecting beyond the latter, one end carrying a blank to be cut, a master screw loosely coupled to the opposite end of said sleeve, means at one end of the master screw for driving the same, means movable with said carriage and operatively connected to the opposite end of the master screw whereby the blank is driven therefrom, a cutter for operating on said blank, an adjustable carrier therefor, and means for operating said cutter.

5. In a screw thread cutting machine, the combination of a bedplate, a carriage mounted to slide thereon, means for holding the same against vertical movement, a sleeve rotatably mounted in said carriage, said sleeve being hollow and projecting beyond the ends of the carriage, a hollow master screw rotatably coupled to one end. of said sleeve, a clutch carried by the opposite end of the sleeve for engaging a blank to be cut, means for driving said master screw, and means mounted on said carriage for transmitting the movement of said screw from a point adjacent the sleeve to said sleeve whereby the latter may be driven and with it the blank to be cut.

6. The combination, in a screw thread cutting machine, of a movable carriage, a rotatable sleeve journaled therein. a master screw rotatably connected to one end of said sleeve, the other end of said sleeve being provided with means for carrying a blank, means in operative engagement with one end of said master screw for rotating and simultaneously moving the same longitudinally, such longitudinal movement being imparted directly to the sleeve and thence to the carriage, and gearing mounted on the carriage and operatively connected with the end of said master screw coupled to the sleeve for imparting rotative movement to said sleeve and blank in the same and in a reverse direction to the movement of the master screw and at the same and at different speeds withV .nation of a carriage movably mounted upon a bed-plate, a rotatable sleeve mounted in said carriage, a master screw coupled to one Vend of said sleeve, a chuck carried b the opposite end of said sleeve for holding a blank to be cut, a cutter for operating on said blank, and independent means mounted on the carriage for transmitting the motion of the master screw to said blank.

8. In a screw thread cutting machine, the combination of a carriage movably mounted upon a bed-plate, a hollow sleeve rotatably mounted in said carriage and carrying a blank to be cut, a master screw coupled to Said sleeve, a cutter for operating on said blank, an adjustable carrier therefor, means for operating said cutter, and means mounted on said carriage and movable therewith for driving the blank directly from the master screw at a. point adjacent its connection with the sleeve, said blank being driven at varying speeds and at speeds differing from the speed of said master screw.

9. The combination, in a screw thread cutting machine, of a movable carriage, a rotatable sleeve mounted therein, roller bearings for said sleeve, a coupling secured to one end of said sleeve, a master screw secured to said coupling, a gear wheel carried by said coupling, a clutch secured to the other end of said sleeve for holding a blank to be cut, friction driving means for rotating the master screw, a separable nut in which said screw is mounted, saidnut serving to impart longitudinal movement to said master screw when it is rotated, and means mounted on= said carriage and movable therewith for rotating the sleeve and the blank carried thereby from the master screw, said means including speed-change gear interposed between the master screw and the sleeve and chuck carrying the blank, and in operative engagement with the gear wheel carried by the master screw coupling.

10. In a screw thread cutting machine, the combination of a carriage movably mounted upon a bed-plate, a. master screw connected to said carriage and rotatable with respect to the same, a chuck also rotatably mounted with respect to said carriage and supporting a blank, friction driving mechanism for rotating said master screw, means for moving it longitudinally, and means mounted ou said carriage and movable therewith for imparting its rotative movclnent to the blank at a speed greater or less than said master screw.

11. In a metal-working machine of the type described, the combination of a standard, a bracket vertically adjustable on said standard, a head revolubly mounted with respect to said bracket, a cutter carried by said' head, gearing carried by the head for driving said cutter including a bevel gear wheel at the center of oscillation of said head, and an anti-friction bearing for said bevel gear wheel.

12. In a metal working machine of the type described, the combination of a bedplate, a carriageV movable, thereop, a rotatable sleeve mounted in said carriage and carrying a blank to be out, a master screw coupled screw at a point adj acent its connection with 10 to said sleeve, means operatively connected the sleeve. v

to the opposite end of said master screw for In testimony whereof I have signed my driving the same, a cutter operating on said name to this speoication in thev presence of eblank, and means mounted on said carriage two subscribing Witnesses.

and movable therewith for driving the blank EDWIN W. CRELLIN. at the same and at speeds differing from that Witnesses: of the master screw, said means being in MURRAY C. BOYER,

operative engagement with said master WM. A. BARR. 

